[matt1234]

Hey guys,
My book doesnt provide answers and im new to chem, looking for someone to confirm my answer is possible. I look on google for most but can find these.
Thank you.

[matt1234]

and another:

[renge ishyo]

e and g look fine as far as I can see. I actually think your approach for b (ozone) is rather interesting, but the accepted way of drawing it's lewis structure can be seen here:

http://commons.wikimedia.org/wiki/File:Ozone-resonance-Lewis-2D.png

[matt1234]

yes i dont understand this, there is more then one way to fill their shells.  Most people told me this would be like math, but i dont see it, alot of times its a guessing game for me. I like math and physics cause is usually clear to me, this is not.  Are there any rules or laws with reguards to situations such as these?

[matt1234]

After reviewing that site in closer detail it appears an electron shifted from the center oxygen to the one on the left.  How can we assume things such as these?

[renge ishyo]

You had to guess in that case (and in my opinion at least, your guess for ozone was a very good one). The "correct" Lewis structures are obtained from experimentally measured physical properties. These properties help narrow things down between the different possible Lewis Structures that you can draw for a compound. In the case of ozone, it is known from experiment that the bond order is 1.5 (i.e. the bonds are halfway between what a single bond or a double bond would be). So a Lewis structure that contains all single bonds would have to be incorrect, because that would predict a bond order of 1 which isn't found experimentally. So they decided on the "resonating" depiction of ozone since it predicts a bond order of 1.5 that agrees with experiment.

Lewis structures are just a rough intro to the subject of chemical bonding; they are not the final word. You will find as you proceed further into chemistry that there are better more quantitative methods to accurately predict the bonding patterns in a molecule. These methods are introduced later simply because they are much harder to grasp.

[matt1234]

thanks for the help I needed that.  Is there a link on this site i can visit to see how to take an ionic compounds name and get the formula and back from the formula to the name. our teacher gave us notes but im confused.  I will be using the Iupac names not the classical names.  im not looking for examples rather a quality set of rules.  Thank you guys your a blessing.

[matt1234]

Some very useful links for people ever in a rut like myself:

Ionic vs covalent bonding
http://www.youtube.com/watch?v=QqjcCvzWwww&feature=related


Ionic bonding - How to
http://www.slideshare.net/alchemist/ionic-bonding-notes

covalent (molecular) bonding - How to
http://www.slideshare.net/kmawhiney/chapter-8-covalent-bonds-presentation


Naming molecular (covalent compounds)
http://www.youtube.com/watch?v=IdC7s_gJRmk&feature=related
http://www.youtube.com/watch?v=WfHvqC2x2n4&feature=related

[matt1234]

Would someone be kind enough too look over my study guide for my test tommorrow and tell me if i have anything mixed up?

http://rapidshare.com/files/287547622/Chem_ch_2_test_prep.docx.html

thanks alot!